Interestingly, Solr also can do a lot of database type work. It can store not just documents for text searches, but also for numeric fields, aggregations, pivot

Interestingly, Solr also can do a lot of database type work. It can store not just documents for text searches, but also for numeric fields, aggregations, pivoting, etc. A nice tool for a data analysis back end. Even the Hue project uses it for its dashboard maker.